Biu Plateau

sopka (bez známé erupce za posledních ~12 000 let), Nigeria, Northern Africa Volcanic Regions

Kde

Nigeria, Northern Africa Volcanic Regions

Typ (GVP)

Volcanic field

Nadmořská výška

930 m

Poloha

10,750°, 12,088°

The Biu Plateau in NE Nigeria is composed of basaltic lava flows. A large number of recent cinder cones with well-defined craters are aligned in a NNW-SSE direction over a distance of 50 km. The cinder cones and lava flows often contain abundant peridotite xenoliths. Work in this area has been inconsistent and infrequent. Age dates (K-Ar) were reported by Lar and others (2013; citing Baudin, 1991) as being in the 5-1.4 Ma range. Fitton and Dunlop (1985) presented K-Ar ages of 5.20 +/- 0.33 Ma for a basalt 24 km S of the town of Biu near the base of the plateau, and 0.84 +/- 0.09 Ma for a basanite on the north end of the plateau; neither roadside sample was clearly identified with a specific cone. Obaje (2009) describes the chronology of the Biu Plateau as "well controlled by radiometric dating" with plateau basalts in the 7-5 Ma range and Quaternary basalts less than 1 Ma; no citations are provided. A pollen record from Lake Tila (Salzmann, 2000) spanned the entire Holocene; however, adjacent graph scales showing age (in ka BP) and core depth terminating at 840 cm have apparently been misunderstood, resulting in Salzmann being cited in some places as indicating volcanism 840,000 years ago.

Text: Smithsonian Global Volcanism Program.

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